acerbity acid acidity acidness acidulousness acridity animosity animus antipathy asperity astringency bad blood bile bite bitingness bitter feeling bitter resentment bitterness bitterness of spirit causticity causticness choler corrosiveness edge feud fierceness gall gnashing of teeth grip hard feelings harshness heartburning ill blood ill feeling ill will incisiveness keenness malevolence malice malignity mordacity mordancy piercingness poignancy point rancor rankling rigor roughness severity sharpness slow burn soreness sourness spite spleen stabbingness sting stridency stringency tartness teeth trenchancy vehemence vendetta venom violence virulence vitriol